The summit, from which the U.S. withdrew Thursday morning, was scheduled to take place June 12 in Singapore.

North Korean leadership didn’t show up to a recent planning meeting by Trump administration officials in Singapore, a senior White House official said, adding that the U.S. made several attempts to communicate with North Korea ahead of what would have been an historic meeting but leadership from the communist nation never responded.

“They stood us up,” the official said.

North Korea’s statement to the U.S. Wednesday night — in which the country threatened to pull out of the summit and called Vice President Mike Pence a “political dummy” — was the first communication the U.S. has heard from the North in a week, the White House said.

“Based on the tremendous anger and open hostility displayed in your most recent statement, I feel it is inappropriate, at this time, to have this long-planned meeting,” Trump stated in a letter to Kim released on Thursday.

STRATEGY ALERT! President Trump just pulled out of the summit with North Korea. He sent a letter to Kim Jong Un citing that with the “tremendous anger” and “hostility” coming from North Korea, he felt it would be “inappropriate” to continue with the summit in June:

WHITE HOUSE – LETTER FROM PRESIDENT TRUMP TO KIM JONG UN OF NORTH KOREA:

“You talk about your nuclear capabilities, but ours are so massive and powerful that I pray to God they will never have to be used,” Trump wrote to Kim. “If you change your mind having to do with this most important summit, please do not hesitate to call me or write. The world, and North Korea in particular, has lost a great opportunity for lasting peace and great prosperity and wealth.”